You need JavaScript to view this

Governing equations for heat and mass transfer in heat-generating porous beds-II. Particulate melting and substrate penetration by dissolution

Abstract

Upon dryout of the bed, the dominant modes of heat transfer are conduction and radiation. Radiation is modeled through the Rosseland approximation. The melting of stainless-steel particulate imbedded in the fuel is modeled by assuming the bed to be a continuum with conduction and radiatio as the dominant modes of heat transfer. The molten steel, after it drains to the bottom of the bed, is assumed to disappear into cracks and mortar joints of the MgO bricks. The melting of fuel in the interior of the bed is modeled identically to the steel particulate, except for the bed settling which is more pronounced in the case of fuel melting and is assumed to be instantaneous owing to the significant weight of overlying bed and sodium pool. The molten layer of fuel, as it collects at the bottom of the bed, causes the heatup of the MgO lining to the eutectic temperature (2280/sup 0/C), and the MgO lining begins to dissolve. The density gradient caused by the dissolution of MgO leads to natural convection and mixing in the molten layer. The submerged fuel particulate also begins to dissolve in the molten solution and ultimately leads to the conversion of debris to  More>>
Publication Date:
Nov 01, 1985
Product Type:
Journal Article
Reference Number:
ERA-11-020007; EDB-86-062166
Resource Relation:
Journal Name: Int. J. Heat Mass Transfer; (United Kingdom); Journal Volume: 28:11
Subject:
22 GENERAL STUDIES OF NUCLEAR REACTORS; REACTOR CORES; DRYOUT; HEAT TRANSFER; MASS TRANSFER; BRICKS; CORE CATCHERS; DISSOLUTION; EQUATIONS; FLOW MODELS; MAGNESIUM OXIDES; MELTING; NATURAL CONVECTION; NUCLEAR FUELS; PARTICULATES; REACTOR SAFETY; STAINLESS STEELS; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; BUILDING MATERIALS; CHALCOGENIDES; CHROMIUM ALLOYS; CONVECTION; CORROSION RESISTANT ALLOYS; ENERGY SOURCES; ENERGY TRANSFER; FUELS; IRON ALLOYS; IRON BASE ALLOYS; MAGNESIUM COMPOUNDS; MATERIALS; MATHEMATICAL MODELS; OXIDES; OXYGEN COMPOUNDS; PARTICLES; PHASE TRANSFORMATIONS; REACTOR COMPONENTS; REACTOR MATERIALS; SAFETY; STEELS; 220900* - Nuclear Reactor Technology- Reactor Safety
OSTI ID:
6093704
Research Organizations:
Reactor Analysis and Safety Division, Argonne National Laboratory, Argonne, IL
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: IJHMA
Submitting Site:
IFI
Size:
Pages: 2137-2148
Announcement Date:

Citation Formats

Chawla, T C, Minkowycz, W J, and Pedersen, D R. Governing equations for heat and mass transfer in heat-generating porous beds-II. Particulate melting and substrate penetration by dissolution. United Kingdom: N. p., 1985. Web. doi:10.1016/0017-9310(85)90108-5.
Chawla, T C, Minkowycz, W J, & Pedersen, D R. Governing equations for heat and mass transfer in heat-generating porous beds-II. Particulate melting and substrate penetration by dissolution. United Kingdom. doi:10.1016/0017-9310(85)90108-5.
Chawla, T C, Minkowycz, W J, and Pedersen, D R. 1985. "Governing equations for heat and mass transfer in heat-generating porous beds-II. Particulate melting and substrate penetration by dissolution." United Kingdom. doi:10.1016/0017-9310(85)90108-5. https://www.osti.gov/servlets/purl/10.1016/0017-9310(85)90108-5.
@misc{etde_6093704,
title = {Governing equations for heat and mass transfer in heat-generating porous beds-II. Particulate melting and substrate penetration by dissolution}
author = {Chawla, T C, Minkowycz, W J, and Pedersen, D R}
abstractNote = {Upon dryout of the bed, the dominant modes of heat transfer are conduction and radiation. Radiation is modeled through the Rosseland approximation. The melting of stainless-steel particulate imbedded in the fuel is modeled by assuming the bed to be a continuum with conduction and radiatio as the dominant modes of heat transfer. The molten steel, after it drains to the bottom of the bed, is assumed to disappear into cracks and mortar joints of the MgO bricks. The melting of fuel in the interior of the bed is modeled identically to the steel particulate, except for the bed settling which is more pronounced in the case of fuel melting and is assumed to be instantaneous owing to the significant weight of overlying bed and sodium pool. The molten layer of fuel, as it collects at the bottom of the bed, causes the heatup of the MgO lining to the eutectic temperature (2280/sup 0/C), and the MgO lining begins to dissolve. The density gradient caused by the dissolution of MgO leads to natural convection and mixing in the molten layer. The submerged fuel particulate also begins to dissolve in the molten solution and ultimately leads to the conversion of debris to a molten pool of fuel and MgO. The process of penetration of the MgO lining continues until the mixing process lowers the concentration of fuel in the volume of the pool to the level where the internal heat rate per unit volume is not enough to keep the body of the pool molten and leads to freezing in the cooler part of the pool. A the molten pool reaches a frozen or a quiescent state, the MgO brick lining thickness provided is deemed ''safe'' for a given bed loading and the external rate of cooling.}
doi = {10.1016/0017-9310(85)90108-5}
journal = {Int. J. Heat Mass Transfer; (United Kingdom)}
volume = {28:11}
journal type = {AC}
place = {United Kingdom}
year = {1985}
month = {Nov}
}